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Goodwill and intangible assets - Schedule of goodwill (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 29, 2019 | Dec. 31, 2018
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning balance | $ 3,848,391 |
Accumulated impairment losses | (1,327,425) | $ (1,327,425)
Goodwill, net, beginning balance | 2,520,966 |
Goodwill recognized during the period | 44,654 |
Currency translation during the period | 82 |
Goodwill, gross, ending balance | 3,893,127 |
Accumulated impairment losses | (1,327,425) | (1,327,425)
Goodwill, net, ending balance | 2,565,702 |
Global Ceramic segment |  |
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning balance | 1,564,987 |
Accumulated impairment losses | (531,930) | (531,930)
Goodwill, net, beginning balance | 1,033,057 |
Goodwill recognized during the period | (2,889) |
Currency translation during the period | 5,879 |
Goodwill, gross, ending balance | 1,567,977 |
Accumulated impairment losses | (531,930) | (531,930)
Goodwill, net, ending balance | 1,036,047 |
Flooring NA segment |  |
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning balance | 874,198 |
Accumulated impairment losses | (343,054) | (343,054)
Goodwill, net, beginning balance | 531,144 |
Goodwill recognized during the period | 0 |
Currency translation during the period | 0 |
Goodwill, gross, ending balance | 874,198 |
Accumulated impairment losses | (343,054) | (343,054)
Goodwill, net, ending balance | 531,144 |
Flooring ROW segment |  |
Goodwill [Roll Forward] |  |
Goodwill, gross, beginning balance | 1,409,206 |
Accumulated impairment losses | (452,441) | (452,441)
Goodwill, net, beginning balance | 956,765 |
Goodwill recognized during the period | 47,543 |
Currency translation during the period | (5,797) |
Goodwill, gross, ending balance | 1,450,952 |
Accumulated impairment losses | (452,441) | $ (452,441)
Goodwill, net, ending balance | $ 998,511 |

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